Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: HK+T Joint Session I: Gas Detectors/TPC
HK 8.4: Talk
Monday, March 27, 2017, 17:45–18:00, F 102
Improving Hough transform algorithm for the track reconstruction of a Time Projection Chamber — •Amir Noori Shirazi and Ivor Fleck — Department Physik, Universität Siegen, Walter-Flex-Str. 3,57068 Siegen, Germany
A Time Projection Chamber (TPC) is foreseen as the main tracking detector for the International Large Detector (ILD) one of the two detectors for the next candidate collider named International Linear Collider (ILC).
GridPix, which is a combination of micro-pattern gaseous detector with a pixelised readout system, is one of the candidate readout systems for the TPC. One of the challenges in the track reconstruction is the large numbers of individual hits along the track (around 100 per cm). Due to the small pixel size of 55 x 55 µ m2, the hits are not consecutive. This leads to the challenge of assigning the individual hits to the correct track. Hits within a given distance from a reconstructed track are called inliers. Consequently, finding inliers within the many hits and noise is difficult for pattern recognition and this difficulty is increased by diffusion effects in the TPC.
In this analysis, a Hough transform is used. Instead of collected the inliers in the image space they are collected directly in the Hough space using a bivariate normal distribution based on the covariance matrix calculated from the diffusion defects. Results for track reconstruction efficiency and double track resolution will be presented.